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CLI-based Configuration Guide - Interface Management

AR100, AR120, AR160, AR1200, AR2200, AR3200, and AR3600 V300R003

This document provides the basic concepts, configuration procedures, and configuration examples of the interfaces supported by the device.
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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
Overview of CPOS Interfaces

Overview of CPOS Interfaces

A CPOS interface is a channelized POS interface that allows a device to effectively converge low-speed access lines.

SONET and SDH

The synchronous optical network (SONET) is an ANSI-defined synchronous transport mode and a global standard transport protocol. It transmits data at a basic rate of 51.84 Mbit/s.

The synchronous digital hierarchy (SDH) is an ITU-T-defined international standard developed based on SONET. SDH uses synchronous multiplexing and flexible mapping structure to produce low-speed tributary signals from SDH signals and does not require a lot of multiplexing and demultiplexing devices. This reduces signal loss and device investment.

The basic rate of SDH is 155.52 Mbit/s, which is called level-1 synchronous transfer module (STM-1). This rate equals the OC-3 rate in SONET.

Table 15-1 lists the common SONET and SDH transmission rates.

Table 15-1  SONET and SDH transmission rates

SONET

SDH

Transmission Rate (Mbit/s)

Electrical Signal

Optical Signal

Optical Signal

STS-1

OC-1

-

51.840

STS-3

OC-3

STM-1

155.520 (155)

STS-9

OC-9

STM-3

466.560

STS-12

OC-12

STM-4

622.080 (622)

STS-18

OC-18

STM-6

933.120

STS-24

OC-24

STM-8

1244.160

STS-36

OC-36

STM-12

1866.240

STS-48

OC-48

STM-16

2488.320 (2.5 Gbit/s)

STS-96

OC-96

STM-32

4876.640

STS-192

OC-192

STM-64

9953.280 (10 Gbit/s)

Introduction to POS

Figure 15-1  Typical POS application diagram

A POS interface uses SONET/SDH to transfer IP data in MAN and WAN. The POS uses the link-layer protocol (FR, PPP and HDLC) to encapsulate IP packets, uses the service adapter at the SONET/SDH channel layer to map the packets to the payload of SONET/SDH signals, then uses the SONET/SDH transport layer and section layer to add a path overhead and segment overhead and encapsulate the payload in a SONET/SDH frame, and finally transmits it on the optical network.

The device provides POS interfaces with two rates and their signal level are OC-3/STM-1 (155 Mbit/s) and OC-12/STM-4 (622 Mbit/s).

CPOS

Low-speed tributary signals can be multiplexed into SDH signals. These low-speed tributary links are known as channels. CPOS interfaces are channelized POS interfaces that use the SDH mechanism to perform refined division of bandwidth. A CPOS interface reduces the number of low-speed physical interfaces required in networking and improves the capability of a device to access leased lines. CPOS interfaces in Figure 15-2 are used in the regional headquarters to converge E1/T1 lines of each branch, improving the convergence ability of the device for low-speed access.

Figure 15-2  Using CPOS interfaces to converge E1/T1 lines

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Updated: 2019-03-06

Document ID: EDOC1100069331

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